Grouping is important for a number of reasons. If you group two activities into one larger activity, you need only show material participation in the activity as a whole. But if the two activities are separate, you must show material participation in each one. On the other hand, if you group two activities into one larger activity and you dispose of one of the two, then you have disposed of only part of your entire interest in the activity. But if the two activities are separate and you dispose of one of them, then you have disposed of your entire interest in that activity.
Net royalty income from intangible property held by a pass-through entity in which you own an interest may be treated as nonpassive royalty income. This applies if you acquired your interest in the pass-through entity after the partnership, S corporation, estate, or trust created the intangible property or performed substantial services or incurred substantial costs for developing or marketing the intangible property.